body,html,div,p,span,h1,h2,h3,h4,h5,h6,table,tr,td,th,ul,li,ol{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
a{
    text-decoration: none;
}

.backStage{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #2b4b6b;
}
.backStage .header{
    height: 60px;
    line-height: 60px;
    text-indent: 30px;
    color: #fff;
    font-weight: 600;

    background-color: #1a2c40;
}
.backStage .main{
    height: calc(100% - 120px);
    background-color: #3f699a;
    display: flex;
}
.backStage .main .main_list{
    width: 250px;
    background-color: #8ed9f8;
}
.backStage .main .main_list ul li{
    width: 90%;
    margin: 10px auto;
    height: 30px;
    line-height: 30px;
    border-radius:5px;
    text-align: center;
    box-shadow: 1px 1px 3px 0 #000;
    background-color: #fff;
}
.backStage .main .main_list ul li.active{
    background-color: #86f8e1;
}
.backStage .main .main_list ul li a{
    display: inline-block;
    width: 100%;
    color: #695df8;
}
.backStage .main .main_con{
    flex: 1;
    width: auto;
    background-color: #73b0c9;
}

.backStage .footer{
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60px;
    line-height: 60px;
    text-align: center;
    color: #fff;
    background-color: #1a2c40;
}
